Anaerobic Digestion of Sewage Wastewaters with Sludge and Rumen Fluid

Citation:
Mwazighe FM, Kamau GN, Mwaniki JM. "Anaerobic Digestion of Sewage Wastewaters with Sludge and Rumen Fluid." European International Journal of Science and Technology. 2014;Vol 3(6):61-66.

Abstract:

Anaerobic digestion was conducted at mesophilic (37oC) and thermophilic (55oC) conditions using sewage
wastewaters as the substrate and sludge and/or rumen fluid as the inoculum, with a view to optimize biogas
production. The substrate and inoculum were mixed in the ratios 1:1, 1:3, and 3:1 (volume by weight (where
sludge was used) or volume by volume (where rumen fluid was used).At mesophilic conditions for both
inocula, the 3:1 substrate/inoculum mixture produced the most biogas in a 24 hour period, with the rumen
mixture producing the highest yield (20 ml). At thermophilic conditions the 3:1 wastewater/sludge mixture
had the highest biogas yield (58 ml), whereas when rumen fluid was used as inoculum, the 1:3 mixture
produced the most biogas (66 ml). The thermophilic experiments using rumen as the inoculum were
repeated for a 10 day period and the 3:1 mixture achieved the maximum yield (140 ml) faster than the other
two (1:1 and 1:3 mixtures) indicating that the 3:1 substrate/inoculum ratio is the best.

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